H3C-C=O
     \
      CN

There must be a hundred ways to make it.

[2] Wacker oxidation of acrylonitrile @ 30°C
[3] from KCN and acetylbromide

Dehydration of 2-oxo-propionaldehyde oxime
[4] with P₂O₅ in CS₂
[5] with acetylchloride

Of these I think 2-oxo-propionaldehyde oxime holds the most promise for it can be prepared from acetone and

[6]ethylnitrite (74% - 45°C - 60min) [looks somewhat familiar,eh ?]
[7]methylnitrite / HCl
[8]AcOH / NaNO₂ at 0°C
[9]N₂CO₃ / Na₂[Fe(CN)₅NO] (sodium nitroprusside)

There are tons more ways out there but one thing sticks out especially: in Patent US2980708 they describe the thermal rearrangement of easily made oxime-acetate
to nitrile by dry distillation. They use the corresponding epoxialdoximes_{(and produce the epoxinitriles which,in turn, can also be used to make the oxonitriles)} but it might as well work on the oxy-aldoxime, too.

comments eagerly awaited

BTW: you may encounter the use of Ac₂O here and there if you're doing research into this topic, besides it's quite useful generally, may it be for the production of AcBr from Ac₂O and HBr, which may sound like the wrong way but have a look at Patent US1430304 where Henry Dryefuss demonstrates how to make Ac₂O by simpy heating a mix of Na₂S₂O₇ and NaOAc. It has once been mentioned before by PolytheneSam but maybe wasn't recognized ??